Sakiohi toyoda



S. TOYODA;

ARRANGEMENT FOR TENSION AND LET-OFF 0F WARPS.

APPLIUATIOH FILED SEPT 25, .1907.

Patented-Apr. 6, 1909.

SAKICHI TOYODA, OF SHIMASAKI-OHO, NAGOYA, JAPAN.

ARRANGEMENT FOR TENSION AND LET-OFF OF WARPS.

Specification of Letters Patent.

Patented April 6, 1909.

Application filed September 25, 1907. Serial No. 394,642.

To all whom a may concern:

Be it known that I, SAKICHI TOYODA, a subject of the Emperor of Japan,residing at Shimasaki-Cho, Nagoya, in the Empire of Japan, have inventedcertain new and useful Improvements in Arrangements for Tension andLet-Oif of arps, of which the following is a specification.

This invention relates to improvements in tension and let-off devicesfor looms and has for its primary object the general reduction oftension usually applied to the warp threads with a view of reducing thefrequency of thread breakage and avoiding the time lost and troublecaused and generally increasing the efliciency and improving theproduct.

One of the principal objects is to provide an automatic tension deviceadapted normally to maintain a pre-determined amount of tension on thewarp and operatively associated with a let-off device so as toautomatically control the warp beam in accordance with the tensionadjustment or application of tension to the warp threads.

A further novel feature consists in the provision of improved means forlocking the tension device, at predetermined times such for instance aswhen the weft is beat up by the reed, for the purpose not only ofpreserving the effected adjustment but also preventing vibration andoscillation of the tension device due to the beat up of the weft.

A further novel feature consists in the rovision of means forautomatically effect- 111g desired tension of the warp when the shed isclosed and preferably during the beating up operation.

Other novel features of the invention will be more fully described inconnection with the accompanying drawings and will be more particularlypointed out and ascertained in and by the appended claims.

In the drawings, Figure l is a view in side elevation of a machineembodying the main features of my invention. Fig. 2 is a front viewpartly in elevation and partly in section taken on line 22 of Fig. 1.Fig. 3 is an enlarged detail view of parts shown in Fig. 2. Fig. 4 is asectional View on line 4.4: of Fig. 1. Fig. 5 illustrates a modifiedconstruction of a device for locking the tension lever.

Like numerals of reference designate similar parts throughout thedifi'erent figures of the drawings.

The device of my invention Will now be described in detail in connectionwith the specific embodiment shown but it will be understood that I donot wish to be limited by such specific disclosure except for suchlimitations as the claims import.

As shown a portion of the frame of a loom is illustrated consisting ofmembers 1 and 2. The warp beam 3 is mounted upon a spindle 4conveniently supported upon frame memher 1 by a bearing such forinstance as indicated by 5. The spindle 4 is provided with a gear wheel6, preferably located inside the frame member 1, and meshing with a gearwheel 7 mounted on a shaft 8 also supported on frame member 1 insuitable bearings such for instance as indicated at 9. The foregoingparts comprise specifically the means where'- by the warp beam isoperatively related with I the improved let-off which will now bedescribed in detail.

A ratchet wheel 10, preferably mounted on shaft 8, is controlled bymeans of a ratchet or escapement mechanism which as shown comprises alever 11, pivotally mounted at 12 and provided with pallets or pawls 13and 14. Said pawls operate substantially the same as the pallets of anescapement lever in a watch movement, the pawl 14 serving to lock thewheel 10 and the pawl 13 serving to retain. it and restrict its movementduring the period intervening the release and reengagement of the pawl14 with said wheel. A spring 15 secured -to the lever 11 at one end andto any suitable stationary part at. its other end serves normally tomaintain the lever in the position shown in Fig. 1. An adjustablemounting is desir-ably provided for the lever 11 in order to regulatethe position of the same with respect to the wheel 10 to insureefiicient operation of the ratchet mechanism and as shown such mountingconsists of a plate 16, which carries the pin 12, and which isadjustablysecured by means of a bolt 17 to a suitable form of bracket 18projecting from the frame member 1 or like stationary part. The lever 11is provided with operating means which as shown consists of a lever 19,pivotally mounted between its ends at 20,

and connected by a link 21 with the lever 11.

At its outer free end said arm 19 is adapted for engagement with meanspreferably in the form of an arm 22 mounted upon a controlling shaft 23which arm serves when rotating to rock the lever 19 upon its pivottightener which as shown consists of a saddle described to] perform itsfunction in another The warp 24 passing from the warp beam 3* o th 10thbeam 5 is t ained Over a moyably mounted in such a manner that when itis moved or adjusted in one position it serves to. slack the warp;threads and when adjusted to another position serves to tighten Qttension e s m As hown h er the improved tightener is adapted to beoperated area by th wa p h eads o Per or its function 1 ne tenaci y andis ad pte to be operated by mechanism to be hereinafter capacity. ltirstdescribhag the tightener in connection with devices adapted to be open ael ereby thro g he act n f h w p thre ds the same i m t d upon, a shaft2 by means of; brackets 28 which as shown are sebnrsd to the bottomportions of the saddle and re keyed o he. sha t 2.7- S aft 2.7? is remolr ou t d in 11 ,0 h pe hangers 29 keyed to and suspended from arock-shaft 3.0. A tension arm 31 is. keyed to shaft 3.().andf extendsrearwardly therefrom preferably in a horizontal plane and is providedwith a weight 32 adapted to be adj'ustably secured to any desiredposition on said arm, It will be obvious from the drawings that when thewarps 24; are tightened owing to continuous rotation of the cloth beam25 they will bear down upon the saddle 2 6 and cause the hangers 29inmove rearwardly and thereby effect rocking movement of the shaft 30. ina contra-clockwise direc- Lion which movement will serve to raise thearm 3 The P n of th Weigh will obviously control th movements of theparts and determine the tension applied to the warp threads. Then thewarp threads become slack the weight 32 will rock the shaft in aclockwise direction restoring the. saddle 26 to a normal position andthereby serving to take up the slack as fast as it forms. It will beunderstood that as the cloth beam 25 rotates it will be necessary toljet-olf the warp from the beam 3 and to this end the arm 31 isoperatively associated with the let-oil mechanism as follows. A pin 33desirably carried by the arm 31 engages a slot 3a formed in a link 35which is connected at 20 with the leverlQ. When the warp threads 2,4.aretaut and it is necessary to. pay out from the warp, beam as shown in Fg-ll he pin 33 w l o upy extr me 1 War pos ion n the slot 3 and 51161331 wi be o c l d by the arm 22. a ut he rivet 2.9- as a fixe fcent r s tht when h outer end of the lever 19 is depressed the pawl l l will belifted out of engagement l with the ratchet wheel 10 andthe latter willbe intermittently rotated the space of a tooth. When however the payoutfrom the warp beam slackens the warp and the arm 31 swlngs downwardlythe pin 33 Wlll occupy a a lowermost position in the slot 3 3% and nomovement will be imparted to the lever 19 by the arm 22 until the warpbeam 25 again takes up the slack whereupon the foregoing operations willbe repeated.

in order to prevent oscillation and vibration of the arm 31 during thebeat up of the weft by the reed and thereby avoid straining and possiblybreaking the warp threads as the result of such vibration means areprovided for locking the arm 31 in whatever position it i'nay assumeduring the beat-up of the reed and releasing said arm immediately afterthe reed has been retracted from its beating-up to its normal po sition.As shown said means consists of lever 36 pivotally mounted at 37 betweenits ends and adapted at one end to be operated by a cam 38 on thecontrolling shaft 23 and carrying at its other end a removably mountedprojection 39 adapted for engage; ment with a rack lQ formed on the arm31. A weight a1 or equivalent means may serve to normally maintain thelever 36 in engagement with the cam 38 and out of en: gagement with. therack 40. The cam 38 is so timed with respect to the reed as to lock thearm 31 when the reed is beating-up the weft. Immediately after the weftis beat-up and the shed is closed by the harness the warp threads becomesuddenly slackened by reason of the closing of the shed and at such timeit is desirable to, take up the slack and for this function separatemechanism is provided which as shown consists of the followingconstruction. A lever 42 is keyed on the shaft 27 carrying the tightenerand which shaft is loosely mounted in the hangers 29 and said leverbears at its opposite end upon a cam 43 mounted on the controlling shaft23., The cam 43 is so timed with respect to theharness that when theshed is closed it will raise the free end of the lever 4,2 and acttherethrough to takeupv the slack in the warp 2% by movement o fthesaddle 26 whichis keyed to the shaft 27.

It will be seen from the foregoing that the tension device includes twoelements namely the tightener 26 and the arm 21 and that these twoelements are movable with respect to each other so that when the arm 31is locked the arm 42 which will be termed auxiliary mechanism may serveto act upon the tightener when the arm 31 is locked although it will beunderstood that the invention is not to be limited to a tensionv deviceincluding two elements one movable with respect to each other. It, willfurther be obvious that the let-ofi' mechanism is controlled by thetension device although it will be clear that the invention may berealized by otherwise controlling said let-oft device.

I clain 1. A loom comprising in combination, a tension device composedof a tightener over which the warp is trained, a shaft upon which saidtightener is mounted, a rockshaft, hangers keyed to said rock-shaft andsupporting said tightener shaft, a weighted arm keyed to saidrock-shaft, an arm keyed to said tightener shaft, a cam for operatingsaid last mentioned arm, and a let-oil device controlled by said firstmentioned arm.

2. A loom comprising in combination, a warp beam, a let off mechanismincluding a ratchet wheel operatively connected with said beam, anescapement lever acting on said wheel, a continuously rotatingescapement actuating member, an element connected with said escapementlever, and a warp tensioning device for throwing said element into andout of operative relation with said member to effect and preventoperation of said escapement lever.

3. A loom comprising in combination, a warp beam, a let off mechanismincluding a ratchet wheel operatively connected with said beam, anescapement lever acting on said ratchet Wheel, a continuously rotatingescapement actuating member, an arm connected with said escapementlever, a link supporting said arm, and a tensioning device looselyconnected with said link and serving when the warp is tensioned to raisesaid arm in cooperative relation with said actuating member andpermitting said arm to descend out of operative relation with saidmember when the warp is slack.

4L. A loom comprising in combination, a tension device comprising atightener over which the warp is trained, a shaft upon which saidtightener is rigidly mounted, a rock shaft, hangers keyed to said rockshaft and loosely supporting said tightening shaft, a weighted armrigidly secured to said rock shaft, and means for operating saidtightener shaft to tension. the warp when the shed is closed.

In testimony whereof I afiix my signature in presence of two witnesses.

SAKICHI TOYODA.

VVitn esses UHACI-II IsHIwARAY, GENJI KURIBARA.

